I'm not really sure what the author wants to say by making a two-face student called Anne Frank win an election supervised by Nazi allegories (No nose creppy head literally reference them as she seig heil).
I guess the only element of surprise is whether she cheated the vote somehow, if the whole thing was rigged from the start, or if she genuinely manipulated everyone.
There was probably a lot of normal stidents who viewed her as a underdog to route for in comparison to the other 2 candidates who were high in individuality. Of course, no one in this school is normal, including someone whose name would be Anne Frak...